I had a series one that I hacked and added an turbonet ethernet card and a bunch of other stuff. Then eventually got a series 2, and finally upgraded to a Series 3 when they had the offer to transfer your lifetime service over. I sold it just a month later when I couldn't get my cable provider to do CableCards. I'm thinking early 2007ish?

I wanted HD and that was the only HD solution that TiVo had, so I ended up just using the cable company's DVR, which was terrible.